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He said: 'It’s a spin class called fly wheel, and every bike is linked to a score board displayed behind the instructor so it’s like a giant race.

'I’m hyper-competitive, so it’s been going really well. I’ve never had a butt like this before in my life. It fills the summer shorts out.'

The 31-year-old David Jones Ambassador is in Australia for the Spring/Summer 2014-15 campaign which also stars models Jessica Gomes, Montana Cox, Nathaniel Vissier and US model Tony Ward.

Toned: Jason puts his new buff body down to a new exercise he's been doing in the US called Fly Wheel

Whilst Jason often returns to Australia to strut the catwalks at the David Jones fashion shows, it was recently revealed that he will soon be returning home for a longer period.

In March the presenter took to Instagram to share some details about his new television venture.

He said: ‘I’m excited to announce that I will be hosting Channel 7 Australia's new prime-time TV show called The Big Adventure.

Good looking: As well a TV presenter, Jason's good looks have earned him a role as a David Jones ambassador

'All I can tell you right now is that the show will see a group of people taken out of their everyday lives and put onto a remote Island in the South Pacific, where they will battle it out for a hidden secret which will change someone's life forever… watch this space.’

From the makers of Seven’s My Kitchen Rules and House Rules, the series will go into production later this year.

While Jason will definitely return down under, it is unknown whether Rey, who he has been with for five years, will join him.

Loved up: Jason lives in New York with his girlfriend of five years Rey-Hanna Vakili